Even so he/she has a duty to help you when you arrive at the surgery describing troubling and potentially dangerous symptoms. You have a child to look after. Is there anyone else at the practice, even a nurse, you could talk to? Quite honestly I'd pop along to the nearest A & E department and very politely plead for five minutes with someone who might be able to advise. It might even be worthwhile changing your G.P. in due course. Or you could maybe ring the hospital and ask to speak to someone who has experience of WLS, stating that you can't go on much longer without help. If you explain what you are going through you might find a sympathetic ear.
I would also ring the local health Trust or whatever it's called. Tell someone there that you need help and that, because you had surgery privately, your GP is very unsympathetic. Mention your responsibilities to your little one, say there is nobody to help (even if there is) and see what they suggest. I do hope you break through and find a male or female knight in shining armour x